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[NFC] Disallow unused prefixes under llvm/test

Authored by mtrofin on Jan 20 2021, 6:37 PM.

Description

[NFC] Disallow unused prefixes under llvm/test

This patch sets the default for llvm tests, with the exception of tests
under Reduce, because quite a few of them use 'FileCheck' as parameter
to a tool, and including a flag as that parameter would complicate
matters.

The rest of the patch undo-es the lit.local.cfg changes we progressively
introduced as temporary measure to avoid regressions under various
directories.

Differential Revision: https://reviews.llvm.org/D95111

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